Is the speed of light greater than C in the space between the plates in the Casimir Effect? ?

The energy is negative between the plates. The density is less than empty free space. So does this make its index of refraction less than 1? If so, would light travel faster than C there?

 V = C/n 

1 Answer

  • Vaman
    Lv 7
    4 weeks ago

    Light has two velocities. One wave velocity and group velocity. Wave velocity can have any value 0 to infinity. But the energy velocity, which is the group velocity, is always less than c, velocity of energy. In the normal physics both have same velocity c. There is no difference. But in the medium they differ a lot. Refractive index is related to wave velocity and not the energy velocity.

    • I am referring to group velocity, not phase velocity. Is the index of refraction of Cassimir effect space less than 1? If so, V = C/n so is the light's group velocity that carries information greater than C? 

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